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Debt and Credit Arrangements - 2018 Notes (Details) - Convertible Notes, Due 2018 - Convertible Debt - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Aug. 01, 2018
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument      
Debt instrument stated interest rate (percent) 2.00%    
Debt instrument face amount $ 57.1 $ 0.0 $ 57.1
Repayment of debt 57.1    
Interest paid $ 0.6    
Debt instrument strike price (per share)   $ 84.96